let gameBoard = document.getElementById什么意思
时间: 2023-07-22 08:54:24 浏览: 48
这是一段 JavaScript 代码,其中 `document.getElementById` 是一个 DOM API 方法,用于获取 HTML 页面中具有指定 `id` 属性的元素节点。在这段代码中,`let gameBoard = document.getElementById(id)` 表示将具有指定 `id` 属性的元素节点赋值给变量 `gameBoard`,以便在代码后续使用该元素节点进行操作。
相关问题
我想要做“城市消消乐”这款游戏,请给我代码
好的,以下是一个简单的“城市消消乐”游戏的代码示例,你可以尝试着理解并自行修改:
HTML 代码:
```html
<!DOCTYPE html>
<html>
<head>
<title>城市消消乐</title>
<style>
.box {
width: 50px;
height: 50px;
border: 1px solid #ccc;
display: inline-block;
margin: 5px;
}
</style>
</head>
<body>
<h1>城市消消乐</h1>
<div id="game"></div>
<button onclick="startGame()">开始游戏</button>
<script src="game.js"></script>
</body>
</html>
```
Javascript 代码(game.js):
```javascript
const colors = ["red", "blue", "green", "yellow", "orange"];
const ROWS = 8;
const COLS = 8;
let score = 0;
let gameboard = [];
function startGame() {
score = 0;
gameboard = generateGameboard(ROWS, COLS);
renderGameboard(gameboard);
}
function generateGameboard(rows, cols) {
let board = [];
for (let i = 0; i < rows; i++) {
let row = [];
for (let j = 0; j < cols; j++) {
row.push(colors[Math.floor(Math.random() * colors.length)]);
}
board.push(row);
}
return board;
}
function renderGameboard(gameboard) {
let game = document.getElementById("game");
game.innerHTML = "";
for (let i = 0; i < gameboard.length; i++) {
let row = gameboard[i];
let divRow = document.createElement("div");
for (let j = 0; j < row.length; j++) {
let divBox = document.createElement("div");
divBox.classList.add("box");
divBox.style.backgroundColor = row[j];
divBox.dataset.row = i;
divBox.dataset.col = j;
divBox.addEventListener("click", handleClick);
divRow.appendChild(divBox);
}
game.appendChild(divRow);
}
}
function handleClick(e) {
let row = parseInt(e.target.dataset.row);
let col = parseInt(e.target.dataset.col);
let color = gameboard[row][col];
let count = removeBlocks(row, col, color);
if (count > 1) {
score += count;
updateScore(score);
renderGameboard(gameboard);
}
}
function updateScore(score) {
let h1 = document.querySelector("h1");
h1.innerText = `城市消消乐 - 得分:${score}`;
}
function removeBlocks(row, col, color) {
let count = 0;
if (gameboard[row][col] !== color) {
return count;
}
gameboard[row][col] = "";
count++;
if (row > 0) {
count += removeBlocks(row - 1, col, color);
}
if (row < ROWS - 1) {
count += removeBlocks(row + 1, col, color);
}
if (col > 0) {
count += removeBlocks(row, col - 1, color);
}
if (col < COLS - 1) {
count += removeBlocks(row, col + 1, color);
}
return count;
}
```
这个游戏的实现思路是:生成一个指定行数和列数的游戏板(即一张色块地图),然后在点击某个色块时将与之相邻的、颜色相同的色块全部消除,并计算分数。
为我提供比较好的代码
好的,以下是一个使用 JavaScript、CSS 和 HTML5 实现的简单贪吃蛇游戏的示例代码,你可以参考一下:
HTML 代码:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>贪吃蛇游戏</title>
<style>
#game-board {
border: 1px solid black;
width: 600px;
height: 400px;
position: relative;
}
.snake {
width: 20px;
height: 20px;
background-color: green;
position: absolute;
}
#food {
width: 20px;
height: 20px;
background-color: red;
position: absolute;
}
</style>
</head>
<body>
<h1>贪吃蛇游戏</h1>
<div id="game-board"></div>
<script src="snake.js"></script>
</body>
</html>
```
JavaScript 代码:
```javascript
const gameBoard = document.getElementById('game-board');
const snake = [{x: 10, y: 10}];
let food = {x: 0, y: 0};
let dx = 0, dy = 0;
let score = 0;
function drawSnake() {
for (let i = 0; i < snake.length; i++) {
const snakeElement = document.createElement('div');
snakeElement.classList.add('snake');
snakeElement.style.left = snake[i].x * 20 + 'px';
snakeElement.style.top = snake[i].y * 20 + 'px';
gameBoard.appendChild(snakeElement);
}
}
function drawFood() {
const foodElement = document.createElement('div');
foodElement.id = 'food';
foodElement.style.left = food.x * 20 + 'px';
foodElement.style.top = food.y * 20 + 'px';
gameBoard.appendChild(foodElement);
}
function moveSnake() {
const newHead = {x: snake[0].x + dx, y: snake[0].y + dy};
snake.unshift(newHead);
if (newHead.x === food.x && newHead.y === food.y) {
score++;
document.getElementById('score').textContent = score;
generateFood();
} else {
snake.pop();
}
checkCollision();
}
function generateFood() {
food.x = Math.floor(Math.random() * 30);
food.y = Math.floor(Math.random() * 20);
drawFood();
}
function checkCollision() {
const head = snake[0];
if (head.x < 0 || head.x >= 30 || head.y < 0 || head.y >= 20) {
gameOver();
}
for (let i = 1; i < snake.length; i++) {
if (head.x === snake[i].x && head.y === snake[i].y) {
gameOver();
}
}
}
function gameOver() {
clearInterval(intervalId);
alert('游戏结束,得分为:' + score);
}
generateFood();
drawSnake();
const intervalId = setInterval(() => {
gameBoard.innerHTML = '';
moveSnake();
drawSnake();
}, 200);
document.addEventListener('keydown', event => {
switch (event.key) {
case 'ArrowUp':
dx = 0;
dy = -1;
break;
case 'ArrowDown':
dx = 0;
dy = 1;
break;
case 'ArrowLeft':
dx = -1;
dy = 0;
break;
case 'ArrowRight':
dx = 1;
dy = 0;
break;
}
});
```
这段代码实现了一个基本的贪吃蛇游戏,包括蛇的移动、食物的生成、得分的计算、碰撞检测等功能。你可以根据自己的需求进行修改和扩展。